It is great to see someone has taken the time to move the question creation module idea forward. Well done Exabis for doing this!
I don't think that Exabis intended to officially launch the new code yet.
I have looked at the code but not in much detail, it looks like the main functionality of the module is all there and the module installed OK for me on Moodle 2.5.
I believe that Exabis have more updates to the code they have written that they will be uploading to github soon. It looks like the backup and restore functionality is not yet working. Also Exabis have, for now, have removed the functionality to have a filtered export of questions. This function allowed a teacher to export questions after grading the questions, so that a teacher can choose to export only questions that have achieved above a certain grade. The idea of which was that good questions created by students could then be exported and reused in quizzes, maybe after some further editing.
Anyway, a big thanks to Exabis, for their contribution, from what I have heard it sounds like they will be continuing to contribute to the support and maintenance of the question creation module. I think we will hear more from them soon about this.